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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
9 2 4
7 3 0 ×
0 × 4 =
0
0 × 20 =
0
0 × 900 =
0
30 × 4 =
120
30 × 20 =
600
30 × 900 =
27000
700 × 4 =
2800
700 × 20 =
14000
700 × 900 =
+ 630000
674520